To talk about something that would, could, or should have happened—but didn’t—you need the conditional perfect, also known as the past conditional.
The conditional perfect is a compound verb form, which means its conjugation has two components: the auxiliary verb haber in the conditional plus the past participle of the main verb.
The Spanish conditional progressive is very similar to its English counterpart (would be + -ing). In both languages, the conditional progressive expresses an action that would be in progress at a certain point in time.
Creer – "to believe" or "to think" – is a common irregular Spanish verb.
Dar, “to give,” is one of the most common Spanish verbs and is irregular in the present tense. It’s used much like its English equivalent.
Deber is a very common Spanish verb with regular conjugations and an unusual relationship to some of its English equivalents. It has several meanings related to obligation, supposition, and expectation.
Decir – to say or to tell – is an irregular Spanish verb.
Estar is one of two Spanish verbs that mean "to be." Estar is used to describe the current state of a noun – temporary, changeable attributes.